Drawing board clamp



Sept. 16, 1952 SQREF DRAWING BOARD CLAMP Filed Jan. 10, 1949 [/7 van [0]":

.,, o.-sTATE Edward'Soref, Milwaukee, Wis.

-QThis invention relates 'to' a means whereby paper and other material can be rigidlyclamped to a drawing board surface.

The most common methods at present, of securing drawing paper and othermaterial to the drawing board is by means of adhesive or by means of thumb tacks which puncture the paper. This means of attaching the drawing material to the board requires additional equipment to be carried and very often mutilates the drawing paper.

On many occasions a readily available drawing board with combined clamp to which the drawing paper could be easily and securely attached would be very desirable.

A conventional drawing board is generally too large and cumbersome to be carried to the actual site of the part or object to be drawn, since the object may be located in the shop or field.

With this proposed improvement all of the necessary information can be drawn in working form at its source. This would eliminate the possibility of incorrectly copy data taken with inadequate means which would necessitate another drawing from an usually incomplete or hasty sketch. I

The most commonly used clip board has a cumbersome clip which could not easily fit in a brief case or folder. More recent boards are designed for mechanical drawing but their nu merous complicated parts increase the possibility of breakage and add to their cost. v It is therefore an object of this invention to provide an effective and inexpensive clamping device attached to a drawing board which will eliminate the use of tacks and adhesives.

It is a further object to provide a compact, portable drawing board and clamp which can be carried in a brief case or folder and which requires a minimum of space. In fact this drawing board, if constructed of a thin gauge metal, need take up only the thickness of several sheets of paper in a folder.

Another purpose served by this invention is that the clamp is an integral part of the paper supporting board. Besides serving as a reinforcement for the rigidity of the board, the clamp, if also raised above the writing surface of the board, serves as a self-contained means to guide drafting instruments, such as straight edges or triangles in order to draw accurate mechanical drawings or sketches. This board was primarilydesigned for the most commonly used paper (8%" x 11") although it can easily be adapted for larger sizes.

Appli ation January 10, 1949, Serial No. 70,084 2' Claims. (01. 45-131) In the accompanying drawing like numerals indicate corresponding parts throughout.

Fig. 1 is an isometric plan view showing the general arrangement of the invention.

Fig. 2 is a sectional. view through the clamp at the line IIII of Fig. 1. Fig. 2 shows the closed position with the paper clamped in place.

Fig. 3 is an enlarged detail looking toward the locking lever of the locking rod. Fig. 3 illustrates the clamp in the open position ready for the insertion of the paper.

Fig. 4 is an elevation view looking toward the locking lever in the closed position.

As illustrated in my drawing, my original idea embodies a sheet of metal; such as steel or preferably aluminum which in addition to its rust resisting properties is more easily formed and stamped. The thinness of this board may be retained by employing wood, plastic, plywood or any other suitably strong material which will retain a level surface. All these materials will require an adaptation of the clamp to be attached to the board.

Itwill, of course, be understood that it is not necessary to have the locking rod contact the paper all along its edges, as it can be relieved and contact only at the corners of the paper.

To insert the paper, simply raise the left hand end of the rod I, Fig. 1, until it is perpendicular to the writing surface 9,'the stationary member, or until it abuts against the stop of Fig. 4. At 3, of Fig. 3, is an open space into which the paper 4, is to beinserted.

In reference to Fig. 3 the paper is secured by merely pushing the paper 4 into the space 3 so as to be in position to be secured. As illustrated in Fig. 3 the lever portion l of the locking rod or movable member is rotated as far as possible or until it contacts the writing surface.

Each of the figures shows 5 as the curled raised guide edges. At Fig. 3, 6 refers to the raised corner which elevates the triangle past one of the guide edges. (See 6 of Fig. 1.) The dotted lines I I of Fig. 1 illustrate the effect the raised corner 6 has on a triangle.

At Fig. 1 three holes for the most commonly used three-ring note book are indicated by 8.

' One type of decalcomania is presented by 10' in Fig. 1. This sheet can be printed with various types of useful drawing aids or mathematical tables. The heavy horizontal lines shown in Fig. 1 are visible through a' single sheet of paper; thereby acting as a guide for sketching and also eliminating the need for ruled paper in letter writing.

It will be apparent from the foregoing description that the structure of this device is very simple and easily manipulated. While I have shown only the preferred form of my invention I wish to have it understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention.

I claim: I p

1. A ldrawirrgi 'fb'oar'cl gpaper clamp :comprising a longitudinal split resilient hollow curle'dbase plate with a round rod snugly fitted within the curl of the base plate, said rod having a flat and being rotatable concentrically withinztnemnrlrot said base plate, said flat being parallel to said base plate to permit insertion of several-P'sheets of paper and means providedvto rotatessaidrrod approximately 90, so as to clamp the paper between the concentric round portion of said 'rod and said resilient basegplate curl.

;:A.:;drawing :board paper iclamp. :cornprising a base plate,1a.;;resilient; frictional .ag ip .member eattachedtto'rzone'zedgemfsaid:base-plataandrcurled "REFERENCES" CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Num-ber Name Date 4,613,354 Mathes Jan. 4, 1927 1,615,827 "Bristow Feb. 1, 1927 $060,355 Twomley Mar. 10, 1936 2,120,686 Sutherland June 14, 1938 ;2,1.523,7.48 V:IE'rederick.r iipr.11,1939 al-415511 v.-"Pr.atti ":Aug. :16, .1949 2,566,465 Robbins-.. ;Sept.;195.1 

